A slitter apparatus comprises: a threaded shaft disposed to extend in a sheet-width direction; a rotor threadingly engaged with the threaded shaft; a frame rotatably holding the rotor and configured to be moved in the sheet-width direction by rotation of the rotor; and a processing module supported by the frame. The processing module is constructed by assembling together multiple components which comprise: a width-direction movement motor for rotating the rotor to move the processing module in the sheet-width direction; a slitter knife for slitting the corrugated paperboard sheet; a rotational drive motor for driving the slitter knife; and an up-down movement motor for moving the slitter knife in an up-down direction, wherein these components are configured to be integrally detached from the frame.
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